Clint,
I'll think you'll find that most people will use the external 'awning' light fitted to the caravan for 'occasional' use. Where a more robust or even pleasant light is required - people will either fit (or have fitted) a 240v external power socket from which mains powered lights can be run.
Personaly, I use a low wattage 240v table tamp in the awning but do still like the comforting glow of a table candle as well.
Steve